BBC - GCSE Bitesize: Photosynthesis and respiration

Each experimental trial was performed at room temperature (21 - 24 degrees Celsius). This was important so that changes in photosynthesis or respiration were isolated to the peas biological processes and not due to a change in temperature. Ten non-germinating peas were weighed, then placed in a sealed bottle and the concentration of CO2 was monitored for a period of ten to twenty minutes. This time was equally divided between light and darkness and was long enough to derive an accurate slope, and consequently photosynthesis and respiration rates, from changes in CO2 concentration. Then ten germinating peas were measured, using the same procedure. A total of two runs for germinating peas and a total of two runs for non-germinating peas were completed for this experiment. The rates derived from these procedures were then divided by its groups corresponding mass. This standardized results so that quantitatively the data was equivalent among trials and not skewed by differences in mass.

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Leaves:make nutrition's for the plant using photosynthesisWater:Photosynthesis & Cellular RespirationPhotosynthesis:

It happens in the chloroplastChlorophyll:allows plants to absorb energy from light The conversion of light energy to chemical energy that is stored in sugars or other organic compoundsOccurs in:PlantsAlgaeCertain prokaryotes Definition:Leaves:THE CELUAR respiration SYSTEM ALSO HAPPENS IN THE LEAVES.CELLULAR respiration:THE CELLULAR respiration CONTAINs MITOCHONDRIA MITOCHONDRIA :breaks down sugar and release energyCellular Respiration process: 6CO2 + 6H2O ------> C6H12O6 + 6O2 Sunlight energyequation :

Why do Plants photosynthesis and RESPIRE

Weperformed a factor analysis to isolate the pure and combined effects ofsources of meteorological variability, including precipitation,radiation and temperature, on model predictions for photosynthesis,respiration, net carbon flux and decadal vegetation dynamics.

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The data for respiration rates from the experiment were consistent with our hypothesis. Rates of respiration were significantly greater among the germinating peas versus the non-germinating variety (P = 0.038 0.05). Therefore, our hypothesis was rejected due to the fact that both respiration and photosynthesis did not demonstrate a significant change between germinating and non-germinating peas.

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is a chemical reaction that happens in the chloroplasts of plant cells. It produces glucose for use by the plant, and oxygen as a waste product. Here are the equations for photosynthesis:

Photosynthesis And Respiration (The Green World) [William G

Plants make their own food by photosynthesis. Carbon dioxide and water react together in the presence of light and chlorophyll to make glucose and oxygen. The glucose is converted into starch, fats and oils for storage. It is used to make cellulose for cell walls, and proteins for growth and repair. It is also used by the plant to release energy by respiration.

interactions exist between photosynthesis and cellular respiration

To unlock the energy in the produced in photosynthesis, green plants need to , just as animals do. Respiration takes place in the plant's cells, using oxygen to produce energy and giving off carbon dioxide as a waste product. So in terms of the gas taken in and the gas given out, respiration is the opposite of photosynthesis.

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The differences in photosynthesis and respiration in germinating and non-germinating peas may help us explain the adaptations plants have made to be successful organisms. Many plants generate seeds to produce their offspring and within these seeds is the genetic information they need to become mature, reproductive plants. Since these seedlings begin without roots to acquire nutrients or leaves to generate energy, an investigation into a seedlings metabolic processes may provide insight into how a seed initially survives to maturity. Therefore, if germinating peas require energy to grow and we compare photosynthesis and respiration rates between germinating and non-germinating peas then we should see higher rates of respiration and photosynthesis in the germinating peas.

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Nevertheless, more experimental trials under the same conditions would be necessary to derive more accurate rates of photosynthesis and respiration. These results are collaborated by those found on the cable web-page, specifically Beer, et al. 2001 who reported significant changes in respiration rates similar to those in this experiment. Also, t-tests for both this study and the Fink et al. 2001 study showed there are no significant differences in photosynthesis rates between germinating and non-germinating peas.